package com.xmutca.nio.c03socket;

import static com.xmutca.nio.c01bytebuffer.ByteBufferUtil.debugRead;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.List;
import lombok.extern.slf4j.Slf4j;

/**
 * 阻塞模式的Server Demo
 * @author <a href="mailto:yhyang@histudy.com">yhyang</a>
 * @since 2021.12.21
 */
@Slf4j
public class Server {

    public static void main(String[] args) throws IOException {
        // 使用 nio 来理解阻塞模式
        //0. ByteBuffer
        ByteBuffer buffer = ByteBuffer.allocate(16);
        //1.创建了服务器
        ServerSocketChannel ssc = ServerSocketChannel.open();

        //2. 绑定监听端口
        ssc.bind(new InetSocketAddress(8080));

        //3. 连接集合
        List<SocketChannel> channels = new ArrayList<>();

        while (true) {
            //4. accept 建立与客户端连接, SocketChannel 用来与客户端直接通讯
            log.debug("connecting...");
            final SocketChannel sc = ssc.accept(); //阻塞方法
            log.debug("connected...{}", sc);
            channels.add(sc);
            for (SocketChannel channel : channels) {
                //5. 接收客户端发送的数据
                log.debug("before read...{}", channel);
                channel.read(buffer);//阻塞方法
                buffer.flip();
                debugRead(buffer);
                buffer.clear();
                log.debug("after read...{}", channel);
            }
        }
    }
}
